New Owner of 1990 Cadillac Eldorado Biarritz

[caddymark]

Thanks for this forum. I am looking forward to learning as much as I can about Cadillacs and particularly my 1990 Eldorado. I am seeking opinions on two upgrades to my car:

1) I want to install a new sound receiver for my car: radio/CD receiver, perhaps touch screen, new speakers

(I don't have the BOSE system -- just stock radio and cassette)

Any suggestions on receivers that coordinate well with the overall dash area, digital display of this model? quality speakers for this interior?

2) My car has the wire wheel covers with dark red centers (Cadillac emblem). Have you seen any updated wheels or rims/caps that might look good on this model?

Thanks for your time. I appreciate this forum and your suggestions.